QUOTE(RedPillReality @ Apr 10 2014, 10:46 PM)
Never thought of it that way, about isolated and compound workouts.
Are you referring to those starting strength plans? I knew about those but I'm afraid of having a wrong form for deadlifts and squats even after watching YouTube videos. I go to Fitness First and the personal trainers are always bugging me to pay them to teach me stuff. RM2xxx for 30 training sessions.
Nevertheless I'll learn those compound movements.
And... I'll fit in leg day too.

(my legs aren't muscular big, just bigger than it's supposed to be)
Thanks a million.

Basically not only starting strength. Compound movements are generally exercise that involve more than 1 joint.
chest = bench press/dips
back = deadlift, row, pull up
shoulder = military/dumbell press
leg = squat
and etc...
For your form, use the weight that you can handle and do for few reps and take a video. You can always post at bodybuilding thread here and ask for form check. As long as your weight is not too heavy to handle, you shouldn't injured urself. I rarely trust PT as they will ask u to avoid squat/deadlift by giving excuses that you ll injured. Just practice your form slowly instead of not doing it.
Leg day has much more benefit than you think other than just building your leg. Trust me, bigger leg can help u build bigger upper body as our lower body muscle(glute, hamstring and quad) are big muscle group that will increase your testosterone level. If you aiming to lose fat, leg day gonna burn hell lot of calorie.
Anyway, just use the first few week to learn the form and increase the weight slowly. Follow a proven/suggested beginner routine and learn how to progressive overload. After a few months, check your result and modify your workout based on your own preference.